Determination of pressure effect on thermocouple electromotive force using multi-anvil apparatus |
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Authors: | Yu Nishihara Kazuki Fuke Yoshinori Tange Yuji Higo |
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Affiliation: | 1. Geodynamics Research Center, Ehime University, Matsuyama, Ehime, Japan;2. Japan Synchrotron Radiation Research Institute, Sayo-gun, Hyogo, Japan |
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Abstract: | We developed a method to determine the absolute pressure effect on thermocouple electromotive force (EMF), based on a single wire method using Kawai-type multi-anvil apparatus. In this method, pressure conditions along the wires were evaluated based on in situ X-ray diffraction using synchrotron X-ray radiation. The pressure effect of the Seebeck coefficients of chromel and alumel was determined up to 7?GPa and 600°C by the analyses of single wire EMFs and pressure-temperature profiles along the wires. The temperature correction for the type K thermocouple was calculated to be from 0°C to –3°C in the studied conditions. Since the multi-anvil apparatus is capable of achieving much higher pressure and temperature, the method presented in this study promises to reveal absolute temperature correction for thermocouples over a wide range of pressure and temperature conditions. |
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Keywords: | Thermocouple multi-anvil apparatus chromel–alumel electromotive force pressure effect |
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